Sargent Makes a good seat as well, I have a corbin seat on my 900ss Ducati, and made the world of difference(for the better) in being able to ride till I needed gas in the tank before stopping.
I have seen a few Corbins as of late, and they seem to be having spotty problems with QC.
I saw one that was SUPPOSED to fit a Moto-Guzzi California special(crusier type bike) and the mount for the seat latch was off by like 2 inches to the side. doh, turn the blueprints over!

You might try to google Drag Specialties, they make quite a bit of stuff for crusiers .